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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span>Copyright 2006 Jerry Huxtable<a name="line.2"></a>
<span class="sourceLineNo">003</span><a name="line.3"></a>
<span class="sourceLineNo">004</span>Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span>you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span>You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>   http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span>distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span>WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span>See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span>limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.github.sarxos.webcam.util.jh;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.awt.image.BufferedImage;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.awt.image.WritableRaster;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>public class JHGrayFilter extends JHFilter {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>        protected boolean canFilterIndexColorModel = true;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>        @Override<a name="line.27"></a>
<span class="sourceLineNo">028</span>        public BufferedImage filter(BufferedImage src, BufferedImage dst) {<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>                int width = src.getWidth();<a name="line.30"></a>
<span class="sourceLineNo">031</span>                int height = src.getHeight();<a name="line.31"></a>
<span class="sourceLineNo">032</span>                int type = src.getType();<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>                WritableRaster srcRaster = src.getRaster();<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>                if (dst == null) {<a name="line.36"></a>
<span class="sourceLineNo">037</span>                        dst = createCompatibleDestImage(src, null);<a name="line.37"></a>
<span class="sourceLineNo">038</span>                }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>                WritableRaster dstRaster = dst.getRaster();<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>                int[] inPixels = new int[width];<a name="line.42"></a>
<span class="sourceLineNo">043</span>                for (int y = 0; y &lt; height; y++) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>                        if (type == BufferedImage.TYPE_INT_ARGB) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>                                srcRaster.getDataElements(0, y, width, 1, inPixels);<a name="line.45"></a>
<span class="sourceLineNo">046</span>                                for (int x = 0; x &lt; width; x++) {<a name="line.46"></a>
<span class="sourceLineNo">047</span>                                        inPixels[x] = filterRGB(inPixels[x]);<a name="line.47"></a>
<span class="sourceLineNo">048</span>                                }<a name="line.48"></a>
<span class="sourceLineNo">049</span>                                dstRaster.setDataElements(0, y, width, 1, inPixels);<a name="line.49"></a>
<span class="sourceLineNo">050</span>                        } else {<a name="line.50"></a>
<span class="sourceLineNo">051</span>                                src.getRGB(0, y, width, 1, inPixels, 0, width);<a name="line.51"></a>
<span class="sourceLineNo">052</span>                                for (int x = 0; x &lt; width; x++) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>                                        inPixels[x] = filterRGB(inPixels[x]);<a name="line.53"></a>
<span class="sourceLineNo">054</span>                                }<a name="line.54"></a>
<span class="sourceLineNo">055</span>                                dst.setRGB(0, y, width, 1, inPixels, 0, width);<a name="line.55"></a>
<span class="sourceLineNo">056</span>                        }<a name="line.56"></a>
<span class="sourceLineNo">057</span>                }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>                return dst;<a name="line.59"></a>
<span class="sourceLineNo">060</span>        }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>        private int filterRGB(int rgb) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>                int a = rgb &amp; 0xff000000;<a name="line.63"></a>
<span class="sourceLineNo">064</span>                int r = (rgb &gt;&gt; 16) &amp; 0xff;<a name="line.64"></a>
<span class="sourceLineNo">065</span>                int g = (rgb &gt;&gt; 8) &amp; 0xff;<a name="line.65"></a>
<span class="sourceLineNo">066</span>                int b = rgb &amp; 0xff;<a name="line.66"></a>
<span class="sourceLineNo">067</span>                rgb = (r * 77 + g * 151 + b * 28) &gt;&gt; 8; // NTSC luma<a name="line.67"></a>
<span class="sourceLineNo">068</span>                return a | (rgb &lt;&lt; 16) | (rgb &lt;&lt; 8) | rgb;<a name="line.68"></a>
<span class="sourceLineNo">069</span>        }<a name="line.69"></a>
<span class="sourceLineNo">070</span>}<a name="line.70"></a>




























































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